fix NodeDescription._describe_facets() for 64bit systems
fix NodeDescription._describe_facets() for 64bit systems

sfepy/sfepy,BubuLK/sfepy,lokik/sfepy,rc/sfepy,lokik/sfepy,rc/sfepy,rc/sfepy,BubuLK/sfepy,lokik/sfepy,vlukes/sfepy,lokik/sfepy,sfepy/sfepy,RexFuzzle/sfepy,sfepy/sfepy,RexFuzzle/sfepy,RexFuzzle/sfepy,BubuLK/sfepy,vlukes/sfepy,RexFuzzle/sfepy,vlukes/sfepy